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-rw-r--r--math/tgmath.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/math/tgmath.h b/math/tgmath.h
index 4c7d957b37..b0ce202d35 100644
--- a/math/tgmath.h
+++ b/math/tgmath.h
@@ -167,7 +167,11 @@
#define log(Val) __TGMATH_UNARY_REAL_IMAG (Val, log, clog)
/* Base-ten logarithm of X. */
-#define log10(Val) __TGMATH_UNARY_REAL_IMAG (Val, log10, __clog10)
+#ifdef __USE_GNU
+# define log10(Val) __TGMATH_UNARY_REAL_IMAG (Val, log10, __clog10)
+#else
+# define log10(Val) __TGMATH_UNARY_REAL_ONLY (Val, log10)
+#endif
/* Return exp(X) - 1. */
#define expm1(Val) __TGMATH_UNARY_REAL_ONLY (Val, expm1)